You are right! I tested the regular email login but didn’t notice it says “Here’s your link to log in at..” instead of “Somebody asked..” Otherwise it’s almost the same.
The /u/admin-login is often referred to as an admin ‘backdoor’. It’s one of the tools that can be used when a misconfiguration has blocked normal login. I think I’ve seen it most used for SSO snafus.
The checkbox to enable safe mode at the same time is also quite handy.